Chapter 9 Kinetics Operation 123
Multiple trigger timing is shown in Figure 77, where a series of 6 subframes is collected
with 6 External Sync pulses.
Figure 77. Kinetics in Shutter Mode: Multiple Trigger Timing Diagram
Array Readout
Kinetics operation uses the CCD to store a limited number of images in rapid succession.
The time it takes to shift each line on the CCD is as short as a few microseconds,
depending on the CCD. Therefore, the time between images can be as short as a few
hundred microseconds.
Returning to our 4 × 6 CCD example, in this case 2/3 of the array is masked, either
mechanically or optically. The shutter opens to expose a 4 × 2 region. While the shutter
remains open charge is quickly shifted just under the mask, and the exposure repeated.
After a third image is collected the intensifier is gated OFF and the CCD is read out.
Since the CCD can be read out slowly, very high dynamic range is achieved. Shifting and
readout are shown in Figure 78.
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